Gravure idol and Engine Sentai Go-Onger actress Yumi Sugimoto stated on her blog that she was diagnosed with acute pyelonephritis. She was ordered to have absolute rest, with that, she temporarily suspended all her activities for two weeks.

According to the blog post, there was a sudden change in Sugimoto's physical condition after she appeared in the stage musical “Annie” last May 6th. At the hospital, she was tested and the doctors found out that it is due to acute pyelonephritis. Acute pyelonephritis is an exudative purulent localized inflammation of the renal pelvis (collecting system) and kidney.

Absolute bed rest for two weeks was ordered, and she is being treated at home. Yumi Sugimoto tells her fans, “I will do my best to get cured and be able to resume activities as soon as possible.”

She should be okay for the most part. While it's definitely a serious condition, it was probably caught early enough. It's also acute, meaning she'll more than likely make a full recovery. If I could give any advice at all it would be do down the cranberry juice as often as possible. Essentially, what she has is Urinary Tract Infection. Anyway, get well soon, Yumi!